﻿namespace SolutionFramework
{
    using System;
    using System.Runtime.Serialization;
    using System.ServiceModel.DomainServices.Client.ApplicationServices;
    using System.ServiceModel.DomainServices.Client;
    using System.Windows;
    using System.Windows.Controls;
    using System.Diagnostics;
    using SolutionFramework.Service;
    using System.Linq;
    using SLControlLibrary;
    using System.Collections.Generic;
    using Microsoft.Practices.Unity;
    using UIObjects;
    using System.Windows.Threading;
    using System.Threading;

    /// <summary>
    /// Main <see cref="Application"/> class.
    /// </summary>
    public partial class App : Application
    {
        private Stack<EventHandler<ApplicationUnhandledExceptionEventArgs>> exceptionHandlers;
        public UnityContainer UIContainer { get; private set; }

        public event EventHandler<ApplicationUnhandledExceptionEventArgs> UnhandledException
        {
            add
            {
                exceptionHandlers.Push(value);
            }

            remove
            {
                Debugger.Break();
            }
        }

        /// <summary>
        /// Creates a new <see cref="App"/> instance.
        /// </summary>
        public App()
        {
            base.UnhandledException += new EventHandler<ApplicationUnhandledExceptionEventArgs>(Application_UnhandledException);
            exceptionHandlers = new Stack<EventHandler<ApplicationUnhandledExceptionEventArgs>>();

            UIContainer = new UnityContainer();

            InitializeComponent();

            // Create a WebContext and add it to the ApplicationLifetimeObjects collection.
            // This will then be available as WebContext.Current.
            WebContext webContext = new WebContext();
            webContext.Authentication = new FormsAuthentication();
            //webContext.Authentication = new WindowsAuthentication();
            this.ApplicationLifetimeObjects.Add(webContext);
        }

        private void Application_Startup(object sender, StartupEventArgs e)
        {
            // This will enable you to bind controls in XAML to WebContext.Current properties.
            this.Resources.Add("WebContext", WebContext.Current);

            // This will automatically authenticate a user when using Windows authentication or when the user chose "Keep me signed in" on a previous login attempt.
            WebContext.Current.Authentication.LoadUser(this.Application_UserLoaded, null);

            // Show some UI to the user while LoadUser is in progress
            this.InitializeRootVisual();

            MouseWheel.Enable(this.RootVisual);
        }

        /// <summary>
        /// Invoked when the <see cref="LoadUserOperation"/> completes.
        /// Use this event handler to switch from the "loading UI" you created in <see cref="InitializeRootVisual"/> to the "application UI".
        /// </summary>
        private void Application_UserLoaded(LoadUserOperation operation)
        {
        }

        /// <summary>
        /// Initializes the <see cref="Application.RootVisual"/> property.
        /// The initial UI will be displayed before the LoadUser operation has completed.
        /// The LoadUser operation will cause user to be logged in automatically if using Windows authentication or if the user had selected the "Keep me signed in" option on a previous login.
        /// </summary>
        protected virtual void InitializeRootVisual()
        {
            SolutionFramework.Controls.BusyIndicator busyIndicator = new SolutionFramework.Controls.BusyIndicator();

            busyIndicator.Content = new MainPage();
            busyIndicator.HorizontalContentAlignment = HorizontalAlignment.Stretch;
            busyIndicator.VerticalContentAlignment = VerticalAlignment.Stretch;

            this.RootVisual = busyIndicator;
        }

        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            foreach (var handler in exceptionHandlers)
            {
                handler(sender, e);

                if (e.Handled)
                {
                    return;
                }
            }

            if (MessageBox.Show("The following error occurred:\r\n\r\n" + e.ExceptionObject.Message + "\r\n\r\nDo you want to debug?", "Solution Framework Client - Error", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
            {
                Debugger.Break();
            }
            else if (MessageBox.Show("Eat message?", "Solution Framework Client - Error", MessageBoxButton.OKCancel) == MessageBoxResult.OK)
            {
                e.Handled = true;
            }

            // If the app is running outside of the debugger then report the exception using a ChildWindow control.
            if (!System.Diagnostics.Debugger.IsAttached)
            {
                // NOTE: This will allow the application to continue running after an exception has been thrown but not handled. 
                // For production applications this error handling should be replaced with something that will report the error to the website and stop the application.
                e.Handled = true;
                ErrorWindow.CreateNew(e.ExceptionObject);
            }
        }
    }
}